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AutoZone produces brake pads using a standard cost system. Each brake pad requires a standard of 2.0 labor hours, and the standard wage rate for a worker is $8.60 per hour. In April, AutoZone produced 8,600 brake pads, and paid its workers $143,910 for a total of 16,500 hours. Two requirements: a. Compute the direct labor rate variance. b. Compute the direct labor efficiency variance. a. Compute the direct labor rate variance. (Do not round your intermediate calculations. Indicate "Favorable". "Unfavorable", or "None" for no effect (1.e., zero variance).) Rate Variance b. Compute the direct labor efficiency variance. (Do not round your intermediate calculations. Indicate "Favorable", "Unfavorable", or "None" for no effect (.e., zero variance).) Efficiency Varlanco